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This release of Bazaar includes handy improvements to the speed of log and
status, new options for several commands, improved documentation, and better
hooks, including initial code for server-side hooks. A number of bugs have
been fixed, particularly in interoperability between different formats or
different releases of Bazaar over there network. There’s been substantial
internal work in both the repository and network code to enable new features
and faster performance.

Pushing a branch in “dirstate” format (Branch5) over bzr+ssh would break
if the remote server was < version 1.2. This was due to a bug in the
RemoteRepository.get_parent_map() fallback code.
(John Arbash Meinel, Andrew Bennetts, #214894)

Fixed performance degradation in fetching from knit repositories to
knits and packs due to parsing the entire revisions.kndx on every graph
walk iteration fixed by using the Repository.get_graph API. There was
another regression in knit => knit fetching which re-read the index for
every revision each side had in common.
(Robert Collins, John Arbash Meinel)

On GNU/Linux bzr additionally looks for plugins in arch-independent site
directory. (Toshio Kuratomi)

The set_rh branch hook is now deprecated. Please migrate
any plugins using this hook to use an alternative, e.g.
post_change_branch_tip. (Ian Clatworthy)

When a plugin cannot be loaded as the file path is not a valid
python module name bzr will now strip a bzr_ prefix from the
front of the suggested name, as many plugins (e.g. bzr-svn)
want to be installed without this prefix. It is a common mistake
to have a folder named “bzr-svn” for that plugin, especially
as this is what bzr branch lp:bzr-svn will give you. (James Westby,
Andrew Cowie)

UniqueIntegerBugTracker now appends bug-ids instead of joining
them to the base URL. Plugins that register bug trackers may
need a trailing / added to the base URL if one is not already there.
(James Wesby, Andrew Cowie)

status now accepts --no-pending to show the status without
listing pending merges, which speeds up the command a lot on large
histories. (James Westby, #202830)

New post_change_branch_tip hook that is called after the
branch tip is moved but while the branch is still write-locked.
See the User Reference for signature details.
(Ian Clatworthy, James Henstridge)

Reconfigure can convert a branch to be standalone or to use a shared
repository. (Aaron Bentley)

The smart protocol now has support for setting branches’ revision info
directly. This should make operations like push slightly faster, and is a
step towards server-side hooks. The new request method name is
Branch.set_last_revision_info. (Andrew Bennetts)

bzrcommit--fixes now recognises “gnome” as a tag by default.
(James Westby, Andrew Cowie)

bzrswitch will attempt to find branches to switch to relative to the
current branch. E.g. bzrswitchbranchname will look for
current_branch/../branchname. (Robert Collins, Jelmer Vernooij,
Wouter van Heyst)

Diff is now more specific about execute-bit changes it describes
(Chad Miller)

Fetching data over HTTP is a bit faster when urllib is used. This is done
by forcing it to recv 64k at a time when reading lines in HTTP headers,
rather than just 1 byte at a time. (Andrew Bennetts)

Log –short and –line are much faster when -r is not specified.
(Aaron Bentley)

Merge is faster. We no longer check a file’s existence unnecessarily
when merging the execute bit. (Aaron Bentley)

bzrstatus on an explicit list of files no longer shows pending
merges, making it much faster on large trees. (John Arbash Meinel)

The launchpad directory service now warns the user if they have not set
their launchpad login and are trying to resolve a URL using it, just
in case they want to do a write operation with it. (James Westby)

The smart protocol client is slightly faster, because it now only queries
the server for the protocol version once per connection. Also, the HTTP
transport will now automatically probe for and use a smart server if
one is present. You can use the new nosmart+ transport decorator
to get the old behaviour. (Andrew Bennetts)

The version command takes a --short option to print just the
version number, for easier use in scripts. (Martin Pool)

Various operations with revision specs and commands that calculate
revnos and revision ids are faster. (John A. Meinel, Aaron Bentley)

Add root_client_path parameter to SmartWSGIApp and
SmartServerRequest. This makes it possible to publish filesystem
locations that don’t exactly match URL paths. SmartServerRequest
subclasses should use the new translate_client_path and
transport_from_client_path methods when dealing with paths received
from a client to take this into account. (Andrew Bennetts, #124089)

bzrmvab can be now used also to rename previously renamed
directories, not only files. (Lukáš Lalinský, #107967)

bzruncommit--local can now remove revisions from the local
branch to be symmetric with bzrcommit--local.
(John Arbash Meinel, #93412)

Don’t ask for a password if there is no real terminal.
(Alexander Belchenko, #69851)

Fix a bug causing a ValueError crash in parse_line_delta_iter when
fetching revisions from a knit to pack repository or vice versa using
bzr:// (including over HTTP or SSH).
(#208418, Andrew Bennetts, Martin Pool, Robert Collins)

Fixed _get_line in bzrlib.smart.medium, which was buggy. Also
fixed _get_bytes in the same module to use the push back buffer.
These bugs had no known impact in normal use, but were problematic for
developers working on the code, and were likely to cause real bugs sooner
or later. (Andrew Bennetts)

Attempting to pull data from a ghost aware repository (e.g. knits) into a
non-ghost aware repository such as weaves will now fail if there are
ghosts. (Robert Collins)

KnitVersionedFile no longer accepts an access_mode parameter, and
now requires the index and access_method parameters to be
supplied. A compatible shim has been kept in the new function
knit.make_file_knit. (Robert Collins)

Log formatters must now provide log_revision instead of show and
show_merge_revno methods. The latter had been deprecated since the 0.17
release. (James Westby)

LoopbackSFTP is now called SocketAsChannelAdapter.
(Andrew Bennetts)

osutils.backup_file is removed. (Alexander Belchenko)

Repository.get_revision_graph is deprecated, with no replacement
method. The method was size(history) and not desirable. (Robert Collins)

revision.revision_graph is deprecated, with no replacement function.
The function was size(history) and not desirable. (Robert Collins)

VersionedFile factories now accept a get_scope parameter rather
than using a call to transaction_finished, allowing the removal of
the fixed list of versioned files per repository. (Robert Collins)

VersionedFile.annotate_iter is deprecated. While in principle this
allowed lower memory use, all users of annotations wanted full file
annotations, and there is no storage format suitable for incremental
line-by-line annotation. (Robert Collins)

VersionedFile.clone_text is deprecated. This performance optimisation
is no longer used - reading the content of a file that is undergoing a
file level merge to identical state on two branches is rare enough, and
not expensive enough to special case. (Robert Collins)

VersionedFile.clear_cache and enable_cache are deprecated.
These methods added significant complexity to the VersionedFile
implementation, but were only used for optimising fetches from knits -
which can be done from outside the knit layer, or via a caching
decorator. As knits are not the default format, the complexity is no
longer worth paying. (Robert Collins)

VersionedFile.create_empty is removed. This method presupposed a
sensible mapping to a transport for individual files, but pack backed
versioned files have no such mapping. (Robert Collins)

VersionedFile.get_graph is deprecated, with no replacement method.
The method was size(history) and not desirable. (Robert Collins)

VersionedFile.get_graph_with_ghosts is deprecated, with no
replacement method. The method was size(history) and not desirable.
(Robert Collins)

VersionedFile.has_ghost is now deprecated, as it is both expensive
and unused outside of a single test. (Robert Collins)

VersionedFile.iter_parents is now deprecated in favour of
get_parent_map which can be used to instantiate a Graph on a
VersionedFile. (Robert Collins)

VersionedFileStore no longer uses the transaction parameter given
to most methods; amongst other things this means that the
get_weave_or_empty method no longer guarantees errors on a missing weave
in a readonly transaction, and no longer caches versioned file instances
which reduces memory pressure (but requires more careful management by
callers to preserve performance). (Robert Collins)

New -Dselftest_debug flag disables clearing of the debug flags during
tests. This is useful if you want to use e.g. -Dhpss to help debug a
failing test. Be aware that using this feature is likely to cause
spurious test failures if used with the full suite. (Andrew Bennetts)

selftest –load-list now uses a new more agressive test loader that will
avoid loading unneeded modules and building their tests. Plugins can use
this new loader by defining a load_tests function instead of a test_suite
function. (a forthcoming patch will provide many examples on how to
implement this).
(Vincent Ladeuil)

selftest –load-list now does some sanity checks regarding duplicate test
IDs and tests present in the list but not found in the actual test suite.
(Vincent Ladeuil)

Slightly more concise format for the selftest progress bar, so there’s
more space to show the test name. (Martin Pool)

[2500/10884, 1fail, 3miss in 1m29s] test_revisionnamespaces.TestRev

The test suite takes much less memory to run, and is a bit faster. This
is done by clearing most attributes of TestCases after running them, if
they succeeded. (Andrew Bennetts)

If a LockableFiles object is not explicitly unlocked (for example
because of a missing try/finally block, it will give a warning but
not automatically unlock itself. (Previously they did.) This
sometimes caused knock-on errors if for example the network connection
had already failed, and should not be relied upon by code.
(Martin Pool, #109520)

makedist target to build a release tarball, and also
check-dist-tarball and dist-upload-escudero. (Martin Pool)

The read_response_tuple method of SmartClientRequestProtocol*
classes will now raise UnknownSmartMethod when appropriate, so that
callers don’t need to try distinguish unknown request errors from other
errors. (Andrew Bennetts)

set_make_working_trees is now implemented provided on all repository
implementations (Aaron Bentley)

VersionedFile now has a new method get_parent_map which, like
Graph.get_parent_map returns a dict of key:parents. (Robert Collins)